School of Physics Lecture Demonstration Manual

Mm-2 Young's Modulus

Published: Thursday 09 March 2006 - Updated: Thursday 24 March 2011

Aim

To demonstrate that the stress is proportional to the strain in a wire under load.

Apparatus

Diagrams

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Young's Modulus Apparatus

Young's Modulus Diagram

Description

Two wires of the same material are suspended side by side from the same support. The main scale is kept taut by the weight L. The extension of the wire for different loads is obtained from the vernier. The unextended length and the diameter of the wire are also measured using the rule and micrometer. Young's modulus can be found from the gradient of the graph and the measured data.

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